Feature/new archiving (#2335)

* Change archiving config page layout

I've changed some wording and moved actions into a
maintenance section.

* Update purge action

Now we have more control on the purge action. The configuration allows
us to choose what to keep and what to discard in a more precise way.
At the moment, the configuration applies for all feeds.

* Add purge configuration on feed level

Now the extend purge configuration is available on feed level.
It is stored as attributes and will be used in the purge action.

* Update purge action

Now the purge action uses the feed configuration if it exists and
defaults on user configuration if not.

* Add empty option in period list

* Fix configuration warnings

* Add archiving configuration on categories

See #2369

* Add user info back

* Add explanations in UI

* Fixes for SQLite + error + misc.

* Fix invalid feed reference

* Short array syntax

Only for new code, so far

* Fix prefix error

* Query performance, default values

Work in progress

* Fix default values and confirm before leaving

Form cancel and confirm changes before leaving were broken.
And start taking advantage of the short echo syntax `<?= ?>` as we have
moved to PHP 5.4+

* More work

* Tuning SQL

* Fix MariaDB + performance issue

* SQL performance

* Fix SQLite bug

* Fix some attributes JSON encoding bugs

Especially for SQLite export/import

* More uniform, fix bugs

More uniform between global, category, feed settings

* Drop special cases for old articles during refresh

Instead will use lastSeen date with the new archiving logic.
This was generating problems anyway
https://github.com/FreshRSS/FreshRSS/issues/2154

* Draft drop index keep_history

Not needed anymore

* MySQL typo

Now properly tested with MySQL, PostgreSQL, SQLite

* More work for legacy values

Important to avoid overriding user's preference and risking deleting
data erroneously

* Fix PHP 7.3 / 7.4 warnings

@aledeg "Trying to use values of type null, bool, int, float or resource
as an array (such as $null["key"]) will now generate a notice. "
https://php.net/migration74.incompatible

* Reintroduce min articles and take care of legacy parameters

* A few changes forgotten

* Draft of migration + DROP of feed.keep_history

* Fix several errors

And give up using const for SQL to allow multiple database types (and we
cannot redefine a const)

* Add keep_min to categories + factorise archiving logic

* Legacy fix

* Fix bug yield from

* Minor: Use JSON_UNESCAPED_SLASHE for attributes

And make more uniform

* Fix sign and missing variable

* Fine tune the logic

1 files changed, 25 insertions, 13 deletions

diff --git a/app/Models/Feed.php b/app/Models/Feed.php
index 8aee9d62f..0a45a1f4c 100644
--- a/app/Models/Feed.php
+++ b/app/Models/Feed.php
@@ -7,8 +7,8 @@ class FreshRSS_Feed extends Minz_Model {
 
 	const TTL_DEFAULT = 0;
 
-	const KEEP_HISTORY_DEFAULT = -2;
-	const KEEP_HISTORY_INFINITE = -1;
+	const ARCHIVING_RETENTION_COUNT_LIMIT = 10000;
+	const ARCHIVING_RETENTION_PERIOD = 'P3M';
 
 	private $id = 0;
 	private $url;
@@ -24,9 +24,8 @@ class FreshRSS_Feed extends Minz_Model {
 	private $pathEntries = '';
 	private $httpAuth = '';
 	private $error = false;
-	private $keep_history = self::KEEP_HISTORY_DEFAULT;
 	private $ttl = self::TTL_DEFAULT;
-	private $attributes = array();
+	private $attributes = [];
 	private $mute = false;
 	private $hash = null;
 	private $lockPath = '';
@@ -110,9 +109,6 @@ class FreshRSS_Feed extends Minz_Model {
 	public function inError() {
 		return $this->error;
 	}
-	public function keepHistory() {
-		return $this->keep_history;
-	}
 	public function ttl() {
 		return $this->ttl;
 	}
@@ -230,12 +226,6 @@ class FreshRSS_Feed extends Minz_Model {
 	public function _error($value) {
 		$this->error = (bool)$value;
 	}
-	public function _keepHistory($value) {
-		$value = intval($value);
-		$value = min($value, 1000000);
-		$value = max($value, self::KEEP_HISTORY_DEFAULT);
-		$this->keep_history = $value;
-	}
 	public function _ttl($value) {
 		$value = intval($value);
 		$value = min($value, 100000000);
@@ -469,6 +459,28 @@ class FreshRSS_Feed extends Minz_Model {
 		$this->entries = $entries;
 	}
 
+	public function cleanOldEntries() {	//Remember to call updateCachedValue($id_feed) or updateCachedValues() just after
+		$archiving = $this->attributes('archiving');
+		if ($archiving == null) {
+			$catDAO = FreshRSS_Factory::createCategoryDao();
+			$category = $catDAO->searchById($this->category());
+			$archiving = $category == null ? null : $category->attributes('archiving');
+			if ($archiving == null) {
+				$archiving = FreshRSS_Context::$user_conf->archiving;
+			}
+		}
+		if (is_array($archiving)) {
+			$entryDAO = FreshRSS_Factory::createEntryDao();
+			$nb = $entryDAO->cleanOldEntries($this->id(), $archiving);
+			if ($nb > 0) {
+				$needFeedCacheRefresh = true;
+				Minz_Log::debug($nb . ' entries cleaned in feed [' . $this->url(false) . '] with: ' . json_encode($archiving));
+			}
+			return $nb;
+		}
+		return false;
+	}
+
 	protected function cacheFilename() {
 		return CACHE_PATH . '/' . md5($this->url) . '.spc';
 	}